﻿#region Copyright Notice
/*
Copyright (C) 2011 by Ashley Ross

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#endregion Copyright Notice

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Manta.UnitTests
{
    /// <summary>
    /// Contains assertion types that are not provided with the standard MSTest assertions.
    /// </summary>
    internal static class ExceptionAssert
    {
        /// <summary>
        /// Checks to make sure that the input delegate throws a exception of type TException.
        /// </summary>
        /// <typeparam name="TException">The type of exception expected.</typeparam>
        /// <param name="blockToExecute">The block of code to execute to generate the exception.</param>
        public static void Throws<TException>(Action blockToExecute) where TException : System.Exception
        {
            try
            {
                blockToExecute();
            }
            catch (Exception ex)
            {
                Assert.IsTrue(ex.GetType() == typeof(TException), "Expected exception of type " + typeof(TException) + " but type of " + ex.GetType() + " was thrown instead.");
                return;
            }

            Assert.Fail("Expected exception of type " + typeof(TException) + " but no exception was thrown.");
        }

        /// <summary>
        /// Checks to make sure that the input delegate throws a exception of type TException.
        /// </summary>
        /// <typeparam name="TException">The type of exception expected.</typeparam>
        /// <param name="blockToExecute">The block of code to execute to generate the exception.</param>
        public static void Throws<TException>(string expectedMessage, Action blockToExecute) where TException : System.Exception
        {
            try
            {
                blockToExecute();
            }
            catch (Exception ex)
            {
                Assert.IsTrue(ex.GetType() == typeof(TException), "Expected exception of type " + typeof(TException) + " but type of " + ex.GetType() + " was thrown instead.");
                Assert.AreEqual(expectedMessage, ex.Message, "Expected exception with a message of '" + expectedMessage + "' but exception with message of '" + ex.Message + "' was thrown instead.");
                return;
            }

            Assert.Fail("Expected exception of type " + typeof(TException) + " but no exception was thrown.");
        }
    }
}